A day of fun at the beach turned into a nightmare for one teen. Michael Dumas, 17, was buried in the sand by his buddies. He didn’t know it at the time, but lurking in the sand were tiny parasites known as hookworms. They bit into Michael’s foot and crawled beneath his skin. As the hookworms made a home there, Michael developed painful sores that became infected. The hookworms most likely came from an infected dog.